Soifs

Tropo spheric OH

Figure 2.3, Sources and sinks of atmospheric methane based on Intergovernmental Panel on Climate Change (1PCC) 1995 assessment. Sec also color plate section.

Tropo spheric OH

Figure 2.3, Sources and sinks of atmospheric methane based on Intergovernmental Panel on Climate Change (1PCC) 1995 assessment. Sec also color plate section.

Figure 2,3 shows the sources and sinks of methane in the farm of pic diagrams. It is evident from this figure that a large variety of sources contribute to the atmospheric methane budget and that most of these sources arc of comparable order of magnitude. The sources that arc under human "control" (fossil fuel burning and handling, animal husbandry, rice agriculture, biomass burning, and waste disposal) make up almost three-quarters of the methane sources. In contrast to the halogenated hydrocarbons, however, which are produced industrially, most methane is produced biologically through microbial fermentation (with the exception of the fossil fuel source), Therefore, methane production is dominated by the harnessing of biological processes through human activity. For example, methane production from rice agriculture closely resembles that from natural wetlands, and the emissions from cattle are similar to those from the large herds of wild ruminants that graze on natural grasslands.

Termites

Wetlands

Burning

Other Natural Oceans

Fossil Fuel

Ruminants

Burning

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